isolated point (Q1142889)

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point x of a subset S (in a topological space X) if x is an element of S but there exists a neighborhood of x which does not contain any other points of S;or, the singleton {x} is an open set in the topological space S (considered as a subspace of X)
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English
isolated point
point x of a subset S (in a topological space X) if x is an element of S but there exists a neighborhood of x which does not contain any other points of S;or, the singleton {x} is an open set in the topological space S (considered as a subspace of X)

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